EPCOS (Munich, Germany) announced its two ceramic multi-layer varistors—in 0405 and 0402 case sizes—that are designed for integration into mobile phones. The 0405 varistors provide ESD protection to the IEC 61000-1-4-2, Level 4 standard (8kV contact, 15kV air discharge). They also act as EMC filters for dual-band mobile phones and suppress interference from the carrier frequencies through two distinct resonant frequencies. Attenuation is 31.7dB (900MHz) and 36.7dB (1.8GHz).
The 0402 devices exhibit very low self-capacitance of <3pF, making them suitable for employment as an antenna varistor with low insertion loss. They also meet the IEC 61000-4-2, Level 4 standard for ESD protection. Aside from mobile phones, these varistors can also be used in palmtops and high-speed data lines.